Improved bluing-compound for the manufacture of paper



tinned ewe pa e can.

JAMES Ho-GBEN, oE

CLEVELAND, 0e10,

Letters Paten-t N 96,321, dated November 2, 1869.

IMPROVED BL'lZTmG-COMPOUND FOR I -HE MANUFACTURE OI PAPER.

The Schedule referred to in these Letters Patent and making part of the same.

1, JAMES HOGBEN, of Cleveland, in the county of Ouyahoga, and State of Ohio, have invented certain Improvements in BluingOompound in the Manufacture of Paper, of which the following is a specification.

Objective.

The nature of my invention relates to the combination of aniline or other suitable red pigment with sulphate of iron,prussiate of potassa, and sulphuricacid, for the purpose of giving the desired tint or color to paper in the process of its manufacture.

Description.

The said'compound consists of the following ingre (lieuts and propositions, or their essential equivalents, viz, sulphate of iron, sixteen pounds; prussiate of potassa, eight pounds; sulphuric acid, eight pounds; red

aniline, two ounces; making altogether thirty-two Previous to drying and grinding, in order to guard against any free acid that may remain in the compound, add one gallon of clear solution of caustic lime. An insoluble sulphate of lime will be formed, if any free acid remains, which sulphate of lime will not'injure the paper.

The relative proportions may be altered and produce the same results, without changing the nature of the invention; and I do not confine myself to the use of red aniline, but employ any suitable red pigment in place thereof that will produce, the same results.

The compound or preparation, without the aniline, maybe used first with the pulp, and the aniline or red pigment subsequently added, while the pulp is in the engine or heaters, but allowing sufficient time for the preparation to he dissolved so completely as to leave no specks or spots upon the paper.

What I claim as my invention, and desire to secure by Letters ?atent, The herein-described compound, prepared and used substantially as and for the purpose set forth.

, JAMES HOGBEN.

Witnesses: v

H. BURRIDGE, J. H. BURRLDGE. 

